CVE-2017-7679: In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, mod_mime can read one byte past the end of a buff

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CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2017-7679 is a critical-severity flaw (CVSS 9.8) affecting http server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, mod_mime can read one byte past the end of a buffer when sending a malicious Content-Type response header.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	39.3% (top 1%)
CISA exploited list	No
Weakness	CWE-126, CWE-119
Published	2017-06-20
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-06-20 01:29 UTCPublished CVE record published
2026-06-17 01:24 UTCUpdated Record last modified

apache http server UPGRADE

Affected: >= 2.2.0 and < 2.2.33 · >= 2.4.0 and < 2.4.26

Fixed in: 2.2.33, 2.4.26

Safe to downgrade to: a release before 2.2.0

1. Check installed version

apt-cache policy http-server || rpm -q http-server || http-server --version

2. UPGRADE to 2.2.33 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade http-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade http-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.2.0 (Debian / Ubuntu)

apt-cache madison http-server sudo apt install http-server=<VERSION_BEFORE_2.2.0> sudo apt-mark hold http-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list http-server sudo dnf downgrade http-server-<VERSION_BEFORE_2.2.0> sudo dnf versionlock add http-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · root · FIXED · 6.40.04-7.fc46 · FEDORA-2026-7329868400 · source

sudo dnf upgrade --advisory=FEDORA-2026-7329868400

Debian 12 · apache2 · FIXED · 2.4.25-4

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.25-4" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · apache2 · FIXED · 2.4.25-4

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.25-4" && echo PATCHED || echo STILL-VULNERABLE

RHEL 6 · httpd · FIXED · httpd-2.2.15-60.el6_9.5

sudo dnf upgrade --advisory=RHSA-2017:2478 rpm -q httpd

RHEL 6.7 Extended Update Support · httpd · FIXED · httpd-2.2.15-47.el6_7.5

sudo dnf upgrade --advisory=RHSA-2017:3195 rpm -q httpd

RHEL 7 · httpd · FIXED · httpd-2.4.6-67.el7_4.2

sudo dnf upgrade --advisory=RHSA-2017:2479 rpm -q httpd

RHEL 7.2 Extended Update Support · httpd · FIXED · httpd-2.4.6-40.el7_2.6

sudo dnf upgrade --advisory=RHSA-2017:3193 rpm -q httpd

RHEL 7.3 Extended Update Support · httpd · FIXED · httpd-2.4.6-45.el7_3.5

sudo dnf upgrade --advisory=RHSA-2017:3194 rpm -q httpd

Alpine 3.20 · apache2 · FIXED · apache2-2.4.26-r0

apk add --upgrade apache2 apk info -v apache2

Alpine 3.21 · apache2 · FIXED · apache2-2.4.26-r0

apk add --upgrade apache2 apk info -v apache2

Alpine 3.22 · apache2 · FIXED · apache2-2.4.26-r0

apk add --upgrade apache2 apk info -v apache2

Alpine 3.23 · apache2 · FIXED · apache2-2.4.26-r0

apk add --upgrade apache2 apk info -v apache2

Amazon Linux 1 · see advisory · FIXED · ALAS-2017-892 · source

sudo yum update --advisory=ALAS-2017-892

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Al-Lord0x/CVE-2017-7679 (1 stars)
Write-up: github.com/gottburgm/Exploits/tree/master/CVE-2017-7679

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-7679?

http server: upgrade to 2.2.33, 2.4.26. Exact commands for each OS are on this page.

Is CVE-2017-7679 being exploited?

CVE-2017-7679 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-7679 affect?

CVE-2017-7679 affects http server. Severity is critical (CVSS 9.8). In Apache httpd 2.2.x before 2.2.33 and 2.4.x before 2.4.26, mod_mime can read one byte past the end of a buffer when sending a malicious Content-Type response header.

How urgent is CVE-2017-7679?

Priority 74/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache HTTP Server vulnerabilities

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References

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